Jig



1 B. BIRD- Sept. 1945.

JIG

Filed Aug. 28, 1943 E mQmQwQ Q INVENTOR; BYRON EHQD,

Patented Sept. 4, 1945 1 Byron M. Bird, Columbus, Ohio, assignor, by

mesne assignments, to The Jeffrey Manufacturing Company, a corporation of Ohio Application August 28, 1943, Serial No. 500,417

2 Claims. (Cl. 209-457) This invention relates to a jig, and an object consequence of this structure, the open area adof the invention is to provide mechanism to jacent the discharge chute I1 and which is also produce an excess of water against the washed adjacent the overflow lip or weir I6, is increased coal overflow lip to increase the mobility of the by at least ten percent with reference to the bed along this area. 5 open area through the rest of the screen or per- Other objects of the invention will appear forated. plate I 3. The result of this is toput an hereinafter, the novel features and combinaexcess of water up against the washed coal overtions being set forth in the appended claims. flow lip or weir Hi. The purpose of this is to In the accompanying drawing, increase the mobility of the bed along this area Fig. l is a sectional elevational view showing since there is considerable friction due to the a jig incorporating the features of my invention; hori o al f ce e e ed by the Water flowing and horizontally through the jig and over the weir or Fig. 2 is an enlarged plan view of a portion p of the screen or perforated plate which sup- In the operation of the device the raw coal will ports the b d of t r a being t t and be fed over the chute I4 and form a bed on the taken on the line 2-2 of Fig. 1, looking i the perforated plate or screen I3. The pulsating direction of the arrows. water will stratify the bed, with the refuse on The principal structure of my jig may follow the bottom and the clean coal on top, the clean that disclosed in my Patent 2,132,376, entitled coal being carried ver h w r r lip 6 w th Method in jigging, dated October 11, 1938, and, the water and discharged by way of chute I5.

it is to be understood that unless a contrary The float mechanism [9 will control the refuse fact is indicated, the jig of my invention follows discharge valve l8 to maintain the refuse bed the structure of this patent. Within predetermined limits. The excess of water Briefly described, the jig includes a cleaning delivered adjacent the refuse discharge chute l1 compartment I 0 which is disclosed more comand the plate leading up to lip or weir I6, will pletely in said patent and is of a Baum type and increase the mobility of the bed at this point or includes a U-shaped water column in which area and thus provide a more efiicient cleaning .the water is pulsated by periodically admitting of the coal.

air under pressure to one side of the column, To facilitate the use of increased Ope ea which air is stored in a tank II and controlled in the screen plate jacent the refuse discharge by valves [2. The bed of material, such as raw in increasing the mobility of the particles at that coal, which is to be treated, is developed on the po the percentage of open area in the :balance screen or perforated plate 13 and the bed strati- 0f the screen plate should be reduced somewhat fled, with the refuse in the bottom stratum and below that normally used. An example of asuitthe clean coal on top. The raw coal is fed to alble plate is one with inch perforation and 22 the compartment by way of feed chute l4 and per cent of open area except abthe refuse-disthe cleaned coal is discharged over chute l5 charge end where three rows of holes are used after passing over a weir or lip l6 which conapproximately inch in diameter and so spaced trols the height of the liquid in the tank or comas to give approximately 30 per cent of open area. partment l0. Refuse is withdrawn by way of Obviously those skilled in the art may make refuse chute l1 and refuse withdrawal mechavarious changes in the details and arrangement nism l8, and the refuse bed is automatically of parts without departing from the spirit and maintained at a predetermined height under scope of the invention as defined by the claims the control of float mechanism I9. Hutch mahereto appended, and I therefore wish not to be terial is delivered by a, screw conveyor 2 to the restricted to the precise construction herein disboot of an elevating conveyor 2| by which it is closed.

elevated and discharged. Having thus described and shown an embodi The structure so far described is found in my ment of my invention, what I desire to secure by Patent No. 32,376 above mentioned. Letters Patent of the United States is:

The particular improvement which I have 1. In a jig, a material cleaning compartment made is the provision of one or more rows of a. perforated member forming the material suplarge holes '22 adjacent the lower end of the porting bottom thereof, a lip over which light screen or perforated plate l3 so that along this material and water flows when leaving said comarea the screen has an increased open area as partment, said perforated member providing a.

compared with the rest of the screen. As a substantially uniform percentage of open space over most of its area, a refuse draw adjacent the discharge end of said perforated member and below said lip, means providing successive upward pulsations of water through said perforated member, and means including a narrow area immediately adjacent the discharge end of said screen provided with a single row of holes thereby providing 2. In a jig; a material cleaningcompartment,

a perforated member forming the material sup;- porting bottom thereof, a lip over which light ma;'-"

{or an egccess of water flow adjacent said terial and water flows when leaving said compartment, said perforated member providing a substantially uniform percentage of open area of approximately 22 percent over its entire area except adjacent said lip where it is approximately 30 percent, and means providing successive upward pulsations of Water through said perforated mein'ber, the aforesaid 0 percent open area. be-

provided by'a single ow of holes in a narrow area immediately adjacent the discharge end 01 said screen.

BYRON M. BIRD. 

